@ARTICLE {FERMONT:2008, title = {Increasing land pressure in East Africa: the changing role of cassava and consequences for sustainability of farming systems}, author = {Fermont, A. and Van Asten, P. and Giller, K. }, journal = {Agriculture, Ecosystems and Environment}, year = {2008}, volume = {128}, number = {4}, pages = {239--250}, issn = {0167-8809}, note = {RTB; Root and Tuber; Cassava}, }